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In the recent past, nonaqueous microemulsions containing ionic liquids (ILs) have been utilized for performing chemical reactions, preparation of nanomaterials, and synthesis of nanostructured polymers and in drug delivery systems. The most promising fact about IL-in-oil microemulsions is their high thermal stability compared to that of aqueous microemulsions. In our earlier publication (Rao, V. G.; Ghosh, S.; Ghatak, C.; Mandal, S.; Brahmachari, U.; Sarkar, N.J. Phys. Chem. B 2012, 116, 2850−2855), we presented for the first time the possibility of creating huge number of IL-in-oil microemulsions, just by replacing the inorganic cation, Na⁺, of NaAOT by any organic cation and using different ionic liquids as the polar core. In this manuscript we are interested in exploring the effect of temperature on such systems. We have characterized the phase diagram of the [Py][TF₂N]/[C₄mim][AOT]/benzene ternary system at …